Reduce environment logging
Reduce environment logging

The log message for configuring the environment as eventlet was
at the info level. Operators don't find this detail interesting
so this should be logged at debug level.

Change-Id: Ic78c5af0c781f6e1e427dbf40da0a8bee9762ea2

himanshu-setia/keystone,idjaw/keystone,promptworks/keystone,nuxeh/keystone,reeshupatel/demo,ilay09/keystone,nuxeh/keystone,promptworks/keystone,dstanek/keystone,openstack/keystone,roopali8/keystone,jonnary/keystone,vivekdhayaal/keystone,takeshineshiro/keystone,ilay09/keystone,cernops/keystone,rajalokan/keystone,mahak/keystone,MaheshIBM/keystone,roopali8/keystone,ajayaa/keystone,ilay09/keystone,jamielennox/keystone,ging/keystone,openstack/keystone,rushiagr/keystone,reeshupatel/demo,dims/keystone,UTSA-ICS/keystone-kerberos,klmitch/keystone,rodrigods/keystone,blueboxgroup/keystone,jumpstarter-io/keystone,ajayaa/keystone,rushiagr/keystone,MaheshIBM/keystone,UTSA-ICS/keystone-kerberos,jonnary/keystone,dstanek/keystone,jamielennox/keystone,himanshu-setia/keystone,promptworks/keystone,reeshupatel/demo,jumpstarter-io/keystone,takeshineshiro/keystone,vivekdhayaal/keystone,rushiagr/keystone,mahak/keystone,dims/keystone,dstanek/keystone,nuxeh/keystone,maestro-hybrid-cloud/keystone,maestro-hybrid-cloud/keystone,rodrigods/keystone,openstack/keystone,rajalokan/keystone,cernops/keystone,mahak/keystone,ging/keystone,vivekdhayaal/keystone,idjaw/keystone,rajalokan/keystone,jumpstarter-io/keystone,klmitch/keystone,blueboxgroup/keystone